In case you haven’t noticed, we’ve entered an era of on-demand media consumption. And due to its mobility and being a natural accompaniment for multitasking, audio has emerged as a favorite among the on-demand public.

It’s not especially groundbreaking to report that teens are largely abandoning books and magazines in favor of smartphones. What is notable about the American Psychological Association’s new report on adolescent media use in the U.S.—one of the most comprehensive studies of its kind to date—is the accelerating rate at which its findings indicate screen time is displacing legacy media consumption.

Engagement time is defined as the total time a page is open and a user is deemed to be active, and it’s what forward-looking publishers are starting to focus on instead of looking at more ‘traditional’ viewing metrics.